<div class="u-radio-group" data-bind="foreach: radioData">
    <div data-bind="koRadio, css: $parent.checkedItem()[$parent.customId]==$data[$parent.customId]?'u-radio-checked': '', 
        click: function(data, event){$parent.clickRadio(data, event, $index());}"></div>
    <label data-bind="html: $data[$parent.customText], css: $parent.radioTextClass"></label>
</div>